These dual action Y valves are ideal for compressor applications. Vented Series has a small hole at the bottom that works as a drain or bleed to reduce line pressure once the valve is closed. Non-vented are rated to 600 psi WOG & Vented are rated to 250 psi WOG. Not for potable water. We offer 2 versions and price points, depending on handle orientation (standard top versus side) & male versus female outlets.